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Optician Q&A

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How do I measure my Pupillary Distance?

Answer:

Measuring Your Pupillary Distance

 

Your pupillary distance is a basic optical measurement which measures the distance between your pupils. This measurement is generally needed when purchasing prescription glasses to ensure that your lenses will be positioned correctly in front of your pupils. Correct placement is important so that you can receive the best corrective vision. To measure it, you can either do it by yourself or with the assistance of a friend. All you need are a ruler and a mirror.

Step 1 – Hold the ruler up to the bridge of your nose. Your pupillary distance ruler can be any millimetre ruler.

Step 2 – Face a mirror.

Step 3 – Close your right eye. Whilst looking in the mirror, Ensure the ruler’s zero is aligned with the centre of your left pupil.

Step 4 – Keep the ruler still. Look straight ahead, close your left eye and open your right eye.

Step 5 – Read the number that aligned with the centre of your right pupil. This number is your pupillary distance.

Step 6 – Repeat the process to ensure you get the most accurate result.

 

The process is the same if you are measuring your PD by yourself although it may be a slightly less accurate measurement. If you need to wear your glasses to do so, you can draw dots on your lenses and then measure the distance between the markings.

 

On average, the pupillary distance for most adults lies between 55 and 65mm, while the average pupillary distance for children is usually between 42 and 54mm. However, for some people, pupillary distance can also vary outside these typical measurements.

 

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